A technician at a Hong Kong international school has been arrested after he was suspected of indecently assaulting female secondary pupils and taking upskirt photos of them.

A spokeswoman for Yew Chung International School confirmed on Friday that a letter had been sent to parents the night before. An image of the document, earlier circulated online by local media, revealed that an “unpleasant incident” had occurred at the Kowloon Tong campus.

A spokesman for the Education Bureau said: “The bureau is aware that the school has activated its crisis management team to handle the incident. Corresponding arrangements have been made to ensure a safe learning environment for pupils.”

He said the bureau “would not comment” on the case as police investigations were under way, but it would keep in close contact with the school and follow up on the situation.

Last October, a male teacher was suspended after being arrested over indecent assault on a pupil at a Tin Shui Wai secondary school.